Andrew Breitbart was preparing new project 'hours before he died'

They said Breitbart had been working on some major expansions of the website, which are schedule to launch soon.

"Andrew was very proud of it," Joel Pollak, editor in chief of Breitbart.com, told Current TV. "He was working very hard on it right up until the last few hours before he died."

Breitbart worked for the Drudge Report and Huffington Post before launching his own conservative websites.

His biggest coup came in May 2011 when he revealed that then U.S. Rep. Anthony Weiner (D-N.Y.) had been sending salacious photographs to women online. At first, Weiner said that his Twitter account had been hacked. He later admitted his misbehavior and apologized to Breitbart.

As Weiner was about to face the media in New York, Breitbart stepped up to the microphones. "I'm here for some vindication," he said. Breitbart's bestselling 2011 memoir was titled "Righteous Indignation: Excuse Me While I Save the World."

Pollak, in the Current interview, did not disclose details of Breitbart's final projects. But he said they would be appearing on the website soon.

"We are going to continue his legacy and build on it," he said. "It’s business as usual at Breitbart.com. It’s not going to be a memorial to Andrew. It’s going to be a living legacy.”

Los Angeles County coroner's officials are trying to determine the exact cause of Breitbart's unexpected death Thursday at age 43.

Sources said Breitbart appeared to have died of natural causes but an autopsy was planned to determine the specific cause.

"It looks like a heart attack, but no one knows until" an autopsy is done, his father-in-law, actor Orson Bean, told The Times.

Officials at Ronald Reagan UCLA Medical Center suspect that Breitbart's death was due to natural causes, Bean said.

"He was walking near the house somewhere .... He was taken by paramedics to UCLA and they couldn't revive him," Bean said. "We're devastated. I loved him like a son."

Breitbart is survived by his wife, Susannah; four children; his parents; and a sister. The family has not announced memorial arrangements.